Yes it is sin. But for the people who live in developing countries like us can't cost lot of money to buy original games, movies, songs etc. So we have to use the pirated copies. The government can provide those original softwares for a low price for us to buy. But the problem is that our government is not interesting in that very much. So we have no other choices but to use pirated copies. And not only in our country even in USA there are lot of people using pirated softwares.